/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: 0 var(--space-5);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
  text-decoration: none;
  line-height: 1;
}

.btn:active { transform: translateY(1px); }

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-primary-contrast);
}

.btn--primary:hover:not(:disabled) { background: var(--color-primary-hover); }

.btn--secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn--secondary:hover:not(:disabled) { border-color: var(--color-primary); color: var(--color-primary); }

.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
}

.btn--ghost:hover:not(:disabled) { color: var(--color-text); background: var(--color-surface-alt); }

.btn--destructive {
  background: transparent;
  color: var(--color-error);
  border-color: var(--color-border);
}

.btn--destructive:hover:not(:disabled) { border-color: var(--color-error); background: color-mix(in srgb, var(--color-error) 8%, transparent); }

.btn--sm {
  min-height: 36px;
  padding: 0 var(--space-4);
  font-size: 0.875rem;
}

.btn--icon {
  min-width: 44px;
  padding: 0;
}

.btn--block { width: 100%; }

.btn svg { width: 1.1em; height: 1.1em; flex-shrink: 0; }

/* ---------- Cards ---------- */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
}

.card--padded { padding: var(--space-6); }

.tool-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
  height: 100%;
}

.tool-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  color: var(--color-text);
}

.tool-card__icon {
  width: 40px;
  height: 40px;
  color: var(--color-primary);
}

.tool-card__title {
  font-size: 1.1rem;
  font-weight: 700;
  margin: 0;
}

.tool-card__desc {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  margin: 0;
  flex-grow: 1;
}

.tool-card__cta {
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.9rem;
}

.benefit-card {
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.benefit-card__icon {
  width: 32px;
  height: 32px;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.step-card {
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  position: relative;
}

.step-card__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-primary-contrast);
  font-weight: 700;
  margin-bottom: var(--space-3);
}

/* ---------- Forms ---------- */

.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.field label {
  font-weight: 600;
  font-size: 0.9rem;
}

.field input[type="text"],
.field input[type="number"] {
  min-height: 44px;
  font-size: 16px;
  padding: 0 var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-family-mono);
}

.field input:focus-visible {
  border-color: var(--color-primary);
}

.field input[aria-invalid="true"] {
  border-color: var(--color-error);
}

.field-error {
  color: var(--color-error);
  font-size: 0.85rem;
  display: none;
}

.field-error--visible { display: block; }

.field-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}

.select {
  min-height: 44px;
  padding: 0 var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: inherit;
  font-size: 0.95rem;
}

.control-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.control-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
}

/* ---------- Converter layout ---------- */

.converter {
  display: grid;
  gap: var(--space-6);
}

@media (min-width: 900px) {
  .converter {
    grid-template-columns: 1fr auto 1fr;
    align-items: start;
  }
}

.converter__swap {
  align-self: center;
  justify-self: center;
}

.converter__preview {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  margin-bottom: var(--space-4);
}

.converter__preview-swatch {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  flex-shrink: 0;
}

.output-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-2);
  background: var(--color-surface);
}

.output-row__label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.output-row__value {
  font-family: var(--font-family-mono);
  font-weight: 600;
}

/* ---------- Color swatch ---------- */

.swatch {
  position: relative;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  overflow: hidden;
  aspect-ratio: 1 / 1;
  min-height: 96px;
  display: flex;
  align-items: flex-end;
}

.swatch__label {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-family-mono);
  font-size: 0.85rem;
  font-weight: 700;
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  min-height: 44px;
}

.swatch__copied {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(17, 24, 39, 0.65);
  color: #fff;
  font-weight: 700;
  font-size: 0.9rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

.swatch--copied .swatch__copied {
  opacity: 1;
}

.palette-grid {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  margin-bottom: var(--space-5);
}

.recent-colors {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.recent-colors__swatch {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  cursor: pointer;
  padding: 0;
}

/* ---------- Upload dropzone ---------- */

.dropzone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface-alt);
  padding: var(--space-7) var(--space-5);
  text-align: center;
  cursor: pointer;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}

.dropzone:hover,
.dropzone:focus-visible {
  border-color: var(--color-primary);
}

.dropzone[data-state="dragover"] {
  border-color: var(--color-primary);
  background: color-mix(in srgb, var(--color-primary) 6%, var(--color-surface-alt));
}

.dropzone[data-state="error"] {
  border-color: var(--color-error);
}

.dropzone__icon {
  width: 40px;
  height: 40px;
  color: var(--color-text-muted);
  margin: 0 auto var(--space-3);
}

.dropzone__hint {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-top: var(--space-2);
}

.dropzone__input {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.upload-preview {
  display: none;
}

.upload-preview[data-visible="true"] {
  display: block;
}

.upload-preview__image-wrap {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: repeating-conic-gradient(#e2e6ea 0% 25%, #f5f6f8 0% 50%) 50% / 20px 20px;
  touch-action: none;
}

.upload-preview__image {
  width: 100%;
  height: auto;
  display: block;
  cursor: crosshair;
}

.upload-preview__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.processing-state {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-muted);
  padding: var(--space-4) 0;
}

.spinner {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2.5px solid var(--color-border);
  border-top-color: var(--color-primary);
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
  .spinner { animation: none; }
}

/* ---------- Alerts / states ---------- */

.alert {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  padding: var(--space-4);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-4);
}

.alert--error {
  border-color: var(--color-error);
  background: color-mix(in srgb, var(--color-error) 8%, var(--color-surface));
  color: var(--color-error);
}

.alert--info {
  background: var(--color-surface-alt);
  color: var(--color-text-muted);
}

.alert svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  margin-top: 2px;
}

.privacy-note {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-block: var(--space-4);
}

.privacy-note svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  color: var(--color-success);
}

.empty-state {
  text-align: center;
  padding: var(--space-6);
  color: var(--color-text-muted);
}

/* ---------- Toast ---------- */

.toast-region {
  position: fixed;
  bottom: var(--space-5);
  left: 50%;
  transform: translateX(-50%);
  z-index: var(--z-toast);
  pointer-events: none;
}

.toast {
  background: var(--color-text);
  color: var(--color-background);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  font-size: 0.9rem;
  font-weight: 600;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity var(--transition-base), transform var(--transition-base);
}

.toast--visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- FAQ accordion (native <details>) ---------- */

.faq-list {
  border-top: 1px solid var(--color-border);
}

.faq-item {
  border-bottom: 1px solid var(--color-border);
}

.faq-item summary {
  cursor: pointer;
  padding: var(--space-4) 0;
  font-weight: 600;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 44px;
}

.faq-item summary::-webkit-details-marker { display: none; }

.faq-item summary::after {
  content: "+";
  font-size: 1.4rem;
  font-weight: 400;
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.faq-item[open] summary::after {
  content: "\2212";
}

.faq-item p {
  padding-bottom: var(--space-4);
  color: var(--color-text-muted);
}

/* ---------- Badges ---------- */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  border-radius: 999px;
  background: var(--color-surface-alt);
  color: var(--color-text-muted);
  font-size: 0.8rem;
  font-weight: 600;
}

/* ---------- Magnifier (image color picker) ---------- */

.magnifier {
  position: absolute;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  border: 3px solid var(--color-surface);
  box-shadow: var(--shadow-md);
  pointer-events: none;
  display: none;
  image-rendering: pixelated;
  overflow: hidden;
}

.magnifier[data-visible="true"] {
  display: block;
}

.picker-marker {
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 3px solid #fff;
  box-shadow: 0 0 0 1.5px rgba(0,0,0,0.5), var(--shadow-sm);
  transform: translate(-50%, -50%);
  pointer-events: none;
  display: none;
}

.picker-marker[data-visible="true"] {
  display: block;
}

/* ---------- Search modal (client-side "quick jump" over real tools) ---------- */

.search-modal {
  position: fixed;
  inset: 0;
  z-index: var(--z-search-modal);
  display: none;
  padding-top: min(15vh, 120px);
}

.search-modal[data-open="true"] {
  display: block;
}

.search-modal__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(17, 24, 39, 0.5);
  backdrop-filter: blur(2px);
}

.search-modal__panel {
  position: relative;
  width: min(560px, 92vw);
  margin: 0 auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.search-modal__input-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.search-modal__input-row svg {
  width: 20px;
  height: 20px;
  color: var(--color-text-muted);
  flex-shrink: 0;
}

.search-modal__input-row input {
  flex: 1;
  border: none;
  background: transparent;
  font: inherit;
  font-size: 16px;
  color: var(--color-text);
  min-width: 0;
}

.search-modal__input-row input:focus {
  outline: none;
}

.search-modal__input-row kbd {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 2px 6px;
  flex-shrink: 0;
}

.search-modal__results {
  list-style: none;
  margin: 0;
  padding: var(--space-2);
  max-height: min(420px, 60vh);
  overflow-y: auto;
}

.search-modal__item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.search-modal__item--active {
  background: var(--color-surface-alt);
}

.search-modal__item-name {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
  font-size: 0.95rem;
}

.search-modal__item-desc {
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.search-modal__empty {
  padding: var(--space-5);
  text-align: center;
  color: var(--color-text-muted);
}